Fan Casting This Looks Like a Job for Aquaman in Sort by Tropes

A situation where a hero's relatively useless abilities turn out to be phenomenally useful because everything's contrived specifically in order to make them useful, even though realistically there's no reason to expect everything to be so convenient. Often involves Locking MacGyver in the Store Cupboard. May be used regularly or as a one-off as part of A Day in the Limelight. If the Aquaman character isn't seen on a regular basis anyway, the day-in-the-limelight version may involve a substantial stroke of luck in the events that lead up to Aquaman just happening to be around at the right time when there's an opportunity to use his powers.